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Atomic structure and devitrification of the Mg82Ca8Au10 metallic glass
DOI:
10.1016/j.jnoncrysol.2024.123157
Authors:
Z.
Molčanová
(Institute of Materials Research, Slovak Academy of Sciences)
,
K.
Saksl
(Technical University of Košice; Institute of Materials Research, Slovak Academy of Sciences)
,
J.
Durisin
(Technical University of Košice)
,
S.
Michalik
(Diamond Light Source)
,
B.
Ballóková
(Institute of Materials Research, Slovak Academy of Sciences)
,
J.
Darpentigny
(CEA-Saclay)
,
P.
Jóvári
(Institute for Solid State Physics and Optics (Hungary))
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Journal Of Non-Crystalline Solids
, VOL 642
State:
Published (Approved)
Published:
October 2024
Abstract: Short range order of a ternary Mg82Ca8Au10 biodegradable amorphous alloy was studied by combining diffraction datasets and Au L3 edge EXAFS data by the Reverse Monte Carlo simulation technique. It was found that while the Mg–Mg bond length agrees well with the empirical atomic diameter of Mg, both the Mg–Ca and Mg–Au mean interatomic distances are ∼9 % shorter than the sum of the corresponding atomic radii. The Ca–Au bond length exhibits ∼14 % shortening. The linear expansion coefficients of the glass determined from the temperature induced shift of the first peak of the structure factor and the reduced pair distribution function are ∼3.7 × 10−5 K−1 and ∼3.1 × 10−5 K−1, respectively. During devitrification, two crystalline phases emerge from the amorphous alloy: hexagonal AuMg3 and the solid solution of Ca in hexagonal close packed Mg. The thermal expansion behaviour of the AuMg3 unit cell was also determined using diffraction data.
Journal Keywords: Metallic glass; Differential scanning calorimetry; Neutron diffraction; X-ray diffraction; EXAFS; Reverse Monte Carlo; Atomic structure; Unit cell parameters
Diamond Keywords: Alloys
Subject Areas:
Materials
Facility: P21.1 at PETRA III
Added On:
14/08/2024 10:56
Documents:
1-s2.0-S002230932400334X-main.pdf
Discipline Tags:
Materials Science
Metallurgy
Technical Tags: